include/linux/iova.h

   1 /*
   2  * Copyright (c) 2006, Intel Corporation.
   3  *
   4  * This file is released under the GPLv2.
   5  *
   6  * Copyright (C) 2006-2008 Intel Corporation
   7  * Author: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
   8  *
   9  */
  10
  11 #ifndef _IOVA_H_
  12 #define _IOVA_H_
  13
  14 #include <linux/types.h>
  15 #include <linux/kernel.h>
  16 #include <linux/rbtree.h>
  17 #include <linux/dma-mapping.h>
  18
  19 /* IO virtual address start page frame number */
  20 #define IOVA_START_PFN          (1)
  21
  22 /* iova structure */
  23 struct iova {
  24         struct rb_node  node;
  25         unsigned long   pfn_hi; /* IOMMU dish out addr hi */
  26         unsigned long   pfn_lo; /* IOMMU dish out addr lo */
  27 };
  28
  29 /* holds all the iova translations for a domain */
  30 struct iova_domain {
  31         spinlock_t      iova_rbtree_lock; /* Lock to protect update of rbtree */
  32         struct rb_root  rbroot;         /* iova domain rbtree root */
  33         struct rb_node  *cached32_node; /* Save last alloced node */
  34         unsigned long   dma_32bit_pfn;
  35 };
  36
  37 static inline unsigned long iova_size(struct iova *iova)
  38 {
  39         return iova->pfn_hi - iova->pfn_lo + 1;
  40 }
  41
  42 struct iova *alloc_iova_mem(void);
  43 void free_iova_mem(struct iova *iova);
  44 void free_iova(struct iova_domain *iovad, unsigned long pfn);
  45 void __free_iova(struct iova_domain *iovad, struct iova *iova);
  46 struct iova *alloc_iova(struct iova_domain *iovad, unsigned long size,
  47         unsigned long limit_pfn,
  48         bool size_aligned);
  49 struct iova *reserve_iova(struct iova_domain *iovad, unsigned long pfn_lo,
  50         unsigned long pfn_hi);
  51 void copy_reserved_iova(struct iova_domain *from, struct iova_domain *to);
  52 void init_iova_domain(struct iova_domain *iovad, unsigned long pfn_32bit);
  53 struct iova *find_iova(struct iova_domain *iovad, unsigned long pfn);
  54 void put_iova_domain(struct iova_domain *iovad);
  55 struct iova *split_and_remove_iova(struct iova_domain *iovad,
  56         struct iova *iova, unsigned long pfn_lo, unsigned long pfn_hi);
  57
  58 #endif